Gelf4NLog is an NLog target implementation to push log messages to GrayLog2. It implements the Gelf specification and communicates with GrayLog server via UDP.

Code forked from https://github.com/akurdyukov/Gelf4NLog which is a fork from https://github.com/RickyKeane/Gelf4NLog who forked the origonal code from https://github.com/seymen/Gelf4NLog

Until v1 is released on nuget we can't promise that we wont introduce breaking changes.

Solution is comprised of 3 projects: Target is the actual NLog target implementation, Tests contains the unit tests for the NLog target, and ConsoleRunner is a simple console project created in order to demonstrate the library usage.

Use Nuget:

PM> Install-Package NLog.Targets.Gelf

Here is a sample nlog configuration snippet:

<configSections>
  <section name="nlog" type="NLog.Config.ConfigSectionHandler, NLog" />
</configSections>

<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

	<extensions>
	  <add assembly="NLog.Targets.Gelf"/>
	</extensions>

	<targets>
	  <!-- Other targets (e.g. console) -->
	
	  <target name="gelf" 
			  xsi:type="gelf" 
			  endpoint="udp://logs.local:12201"
			  facility="console-runner"
			  sendLastFormatParameter="true"
	  >
		<!-- Optional parameters -->
		<parameter name="param1" layout="${longdate}"/>
		<parameter name="param2" layout="${callsite}"/>
	  </target>
	</targets>

	<rules>
	  <logger name="*" minlevel="Debug" writeTo="gelf" />
	</rules>

</nlog>

Options are the following:

• name: arbitrary name given to the target
• xsi:type: set this to "gelf"
• endpoint: the uri pointing to the graylog2 input in the format udp://{IP or host name}:{port} note: support is currently only for udp transport protocol
• facility: The graylog2 facility to send log messages
• sendLastFormatParameter: default false. If true last parameter of message format will be sent to graylog as separate field per property

###Code

//excerpt from ConsoleRunner
var eventInfo = new LogEventInfo
				{
					Message = comic.Title,
					Level = LogLevel.Info,
				};
eventInfo.Properties.Add("Publisher", comic.Publisher);
eventInfo.Properties.Add("ReleaseDate", comic.ReleaseDate);
Logger.Log(eventInfo);

or alternatively for simple log messages

Logger.Info("Simple message {0}", value);

or alternatively for use of sendLastFormatParameter

Logger.Info(comic.Title, new { Publisher = comic.Publisher, ReleaseDate = comic.ReleaseDate });

will log Publisher and ReleaseDate as separate fields in Graylog